The adsorption characteristics of nitrate on Mg-Fe and Mg-Al layered double hydroxides in a simulated soil solution

A. Halajnia; S. Oustan; N. Najafi; A. R. Khataee; A. Lakzian

doi:10.1016/j.clay.2012.09.007

The adsorption characteristics of nitrate on Mg-Fe and Mg-Al layered double hydroxides in a simulated soil solution

A. Halajnia^*, S. Oustan, N. Najafi, A. R. Khataee, A. Lakzian

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

110 Citations (Scopus)

Abstract

Four types of layered double hydroxides (LDHs) synthesized by coprecipitation method including Mg-Al and Mg-Fe in 3:1 and 4:1 ratios of M²⁺/M³⁺ were compared in terms of chemical structure, nitrate adsorption isotherm and kinetics, thermodynamic parameters, anion exchange capacity and nitrate selectivity in the presence of common anions found in soil solutions. Moreover, the influence of calcination on nitrate adsorption was studied. Results showed that the Mg-Al-LDH (4:1) was most effective for the removal of nitrate and its selectivity for nitrate adsorption was remarkable in the presence of phosphate, sulfate and bicarbonate. The nitrate adsorption on Mg-Al-LDH (4:1) followed a pseudo-second order model with rate constant of 0.623gmmol^-1min^-1. Furthermore, the kinetic data were described very well with the intraparticle diffusion model with rate constant of 0.046mmolg^-1min^-0.5. The nitrate adsorption isotherm of Mg-Al-LDH (4:1) described well with the Freundlich model as indicated by the high values of R². The negative values of δH_r^o indicated that the nitrate adsorption on the LDHs was exothermic in nature. Calcination of the LDHs had no significant effect on increasing nitrate adsorption.

Original language	English
Pages (from-to)	28-36
Number of pages	9
Journal	Applied Clay Science
Volume	70
DOIs	https://doi.org/10.1016/j.clay.2012.09.007
Publication status	Published - Dec 2012
Externally published	Yes

Keywords

Adsorption
Calcinations
Kinetics
Layered double hydroxides
Nitrate
Thermodynamic parameters

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10.1016/j.clay.2012.09.007

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title = "The adsorption characteristics of nitrate on Mg-Fe and Mg-Al layered double hydroxides in a simulated soil solution",

abstract = "Four types of layered double hydroxides (LDHs) synthesized by coprecipitation method including Mg-Al and Mg-Fe in 3:1 and 4:1 ratios of M2+/M3+ were compared in terms of chemical structure, nitrate adsorption isotherm and kinetics, thermodynamic parameters, anion exchange capacity and nitrate selectivity in the presence of common anions found in soil solutions. Moreover, the influence of calcination on nitrate adsorption was studied. Results showed that the Mg-Al-LDH (4:1) was most effective for the removal of nitrate and its selectivity for nitrate adsorption was remarkable in the presence of phosphate, sulfate and bicarbonate. The nitrate adsorption on Mg-Al-LDH (4:1) followed a pseudo-second order model with rate constant of 0.623gmmol-1min-1. Furthermore, the kinetic data were described very well with the intraparticle diffusion model with rate constant of 0.046mmolg-1min-0.5. The nitrate adsorption isotherm of Mg-Al-LDH (4:1) described well with the Freundlich model as indicated by the high values of R2. The negative values of δHro indicated that the nitrate adsorption on the LDHs was exothermic in nature. Calcination of the LDHs had no significant effect on increasing nitrate adsorption.",

keywords = "Adsorption, Calcinations, Kinetics, Layered double hydroxides, Nitrate, Thermodynamic parameters",

author = "A. Halajnia and S. Oustan and N. Najafi and Khataee, {A. R.} and A. Lakzian",

year = "2012",

month = dec,

doi = "10.1016/j.clay.2012.09.007",

language = "English",

volume = "70",

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journal = "Applied Clay Science",

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T1 - The adsorption characteristics of nitrate on Mg-Fe and Mg-Al layered double hydroxides in a simulated soil solution

AU - Halajnia, A.

AU - Oustan, S.

AU - Najafi, N.

AU - Khataee, A. R.

AU - Lakzian, A.

PY - 2012/12

Y1 - 2012/12

N2 - Four types of layered double hydroxides (LDHs) synthesized by coprecipitation method including Mg-Al and Mg-Fe in 3:1 and 4:1 ratios of M2+/M3+ were compared in terms of chemical structure, nitrate adsorption isotherm and kinetics, thermodynamic parameters, anion exchange capacity and nitrate selectivity in the presence of common anions found in soil solutions. Moreover, the influence of calcination on nitrate adsorption was studied. Results showed that the Mg-Al-LDH (4:1) was most effective for the removal of nitrate and its selectivity for nitrate adsorption was remarkable in the presence of phosphate, sulfate and bicarbonate. The nitrate adsorption on Mg-Al-LDH (4:1) followed a pseudo-second order model with rate constant of 0.623gmmol-1min-1. Furthermore, the kinetic data were described very well with the intraparticle diffusion model with rate constant of 0.046mmolg-1min-0.5. The nitrate adsorption isotherm of Mg-Al-LDH (4:1) described well with the Freundlich model as indicated by the high values of R2. The negative values of δHro indicated that the nitrate adsorption on the LDHs was exothermic in nature. Calcination of the LDHs had no significant effect on increasing nitrate adsorption.

AB - Four types of layered double hydroxides (LDHs) synthesized by coprecipitation method including Mg-Al and Mg-Fe in 3:1 and 4:1 ratios of M2+/M3+ were compared in terms of chemical structure, nitrate adsorption isotherm and kinetics, thermodynamic parameters, anion exchange capacity and nitrate selectivity in the presence of common anions found in soil solutions. Moreover, the influence of calcination on nitrate adsorption was studied. Results showed that the Mg-Al-LDH (4:1) was most effective for the removal of nitrate and its selectivity for nitrate adsorption was remarkable in the presence of phosphate, sulfate and bicarbonate. The nitrate adsorption on Mg-Al-LDH (4:1) followed a pseudo-second order model with rate constant of 0.623gmmol-1min-1. Furthermore, the kinetic data were described very well with the intraparticle diffusion model with rate constant of 0.046mmolg-1min-0.5. The nitrate adsorption isotherm of Mg-Al-LDH (4:1) described well with the Freundlich model as indicated by the high values of R2. The negative values of δHro indicated that the nitrate adsorption on the LDHs was exothermic in nature. Calcination of the LDHs had no significant effect on increasing nitrate adsorption.

KW - Adsorption

KW - Calcinations

KW - Kinetics

KW - Layered double hydroxides

KW - Nitrate

KW - Thermodynamic parameters

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U2 - 10.1016/j.clay.2012.09.007

DO - 10.1016/j.clay.2012.09.007

M3 - Article

AN - SCOPUS:84867417197

SN - 0169-1317

VL - 70

SP - 28

EP - 36

JO - Applied Clay Science

JF - Applied Clay Science

ER -

The adsorption characteristics of nitrate on Mg-Fe and Mg-Al layered double hydroxides in a simulated soil solution

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Keywords

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